Fix Permutation Palindrome Solution2 - #233
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Solution2 required exactly one odd character count, so even-length inputs like "oooo" or "abba" were reported as not being palindrome permutations. Relax the check to at most one odd count and cover the case with tests. Also drop the unused parameter in Solution1. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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